If you mean, what is the red blood cell's main function; it is the oxygen carrier. The red is of haemoglobin, an iron compound that readily reacts with oxygen. The reaction is reversed in the cell needing the carried oxygen.
Red blood cells contain hemoglobin. These cells are also known as erythrocytes.
Red blood cells because that is what carries oxygen throughout the body
red blood cells
Red blood cells contain hemoglobin, but white blood cells do not
As the name says, red blood cells are found in the blood. If there is blood there, there is red blood cells.
The old red blood cells get replaced by the newly formed red blood cells.
Red blood cells, white blood cells, platelets and liquid plasma.Red blood cells, white blood cells, platelets and liquid plasma.
Red blood cells (also called erythrocytes)
White blood cells have a nucleus and red blood cells don't.
Red and white blood cells.
White blood cells have a nucleus and red blood cells don't.
Red blood cells are the most common in human blood.